ASTM A354-07a

Scope
This specification covers quenched and tempered alloy steel bolts, studs and other externally threaded fasteners, 4″ and under in diameter and under normal atmospheric temperatures, where high strength is required an for limited application at elevated temperature. Any alloy steel capable of meeting the minimum mechanical and chemical properties set forth in this specification may be used.

***For bolts, studs & other externally threaded fasteners for use at elevated temperatures, refer to A193.***

1.2 Two levels of bolting strength are covered, designated Grades BC and BD. Selection will depend upon design and the stresses and service for which the product is to be used.

NOTE 2—Quenched and tempered alloy steel bolts for structural steel joints up through 1-1⁄2 in. in diameter are covered in Specification A490.  Alloy steel bolts, studs, and other externally threaded fasteners (that is, heavy hex-structural bolts over 1-1⁄2 in., hex bolts, anchor bolts, and countersunk bolts) exhibiting similar mechanical properties to bolts conforming to Specification A490 shall be covered by Grade BD of this  specification. When bolts of Grade BD of this specification are considered for pretentioned applications in excess of 50 % of the bolt tensile strength, the additional requirements of head size, maximum tensile strength, nut size and strength, washer hardness, tests, and inspections contained in Specification A490 should be carefully considered.

1.3 Nuts are covered in Specification A563. Unless otherwise specified, the grade and style of nut for each grade of fastener shall be as follows:

A354 Grades

Grade Surface FinishNut GradeNut Style
BCPlain (or with a coating insufficient thickness to require over-tapped nutsCHeavy Hex
BCZinc-coated (or with a coating thickness requiring over-tapped nutsDHHeavy Hex
BDAll FinishesDHHeavy Hex
Source: A354-07a

Table 1: Chemical Requirements

ElementHeat Analysis %Product Analysis %
Carbon ≤ 1-1/2"0.30 to 0.530.28 to 0.55
Carbon > 1-1/2"0.35 to 0.530.33 to 0.55
Phosphorus, max0.0350.04
Sulfur, max0.040.045
Source: ASTM A354-07a

Table 2: Hardness Requirements for Full-Size Fasteners

SizeGradeBrinnellRockwell C
MinMaxMinMax
1/4 to 2-1/2BC2253312636
Over 2-1/2BC2353112233
1/4 to 2-1/2BD3113633339
Over 2-1/2BD2933633139
Source: A354-07a

Table 3: Tensile Requirements for All Full-Size Fasteners

DiameterTheads/InchStreas Area ᴬ in²Grade BCGrade BD
Tensile Strength, min lbf ᴮProof Load, min lbf ᶜYield Strength 0.2% offset min, lbf ᴰTensile Strength, min, lbf ᴱProof Load min, lbf ᶠYield Strength 0.2% offset, min lbf ᴳ
3/4100.334417503505036400501004010043400
3/4160.373466003910040650560004480048450
7/890.462577504850050350693005545060100
7/8140.509636005340055450764006110066150
180.606757506365066050909007270078800
1120.663829006970072250994007960086150
114 UNS0.67984900713007440001019008150088250
1-1/870.7639540080100831501145009155099200
1-1/880.7998750829508620011850094800102700
1-1/8120.8561070008980093300128400102700111250
1-1/470.969121500101750105600145350116300126000
1-1/481125000105000109000150000120000130000
1-1/4121.073134100112600116950161000128800139450
1-3/861.155144400121300125900173250138600150200
1-3/881.233154150129450134400185000148000160300
1-3/8121.315164400138100143300197200157800170950
1-1/261.405175650147550153150210750168600182500
1-1/281.492186500156650162250233800175050194000
1-1/2121.581197600166000172300237200189700205500
1-3/451.9237500199500207100285000228000247000
1-3/482.08260000218400226700312000249600270000
24-1/22.5312500262500272500375000300000325000
282.77346250290850301950415000332400360000
2-1/44-1/23.25406250341250354250487000390000422500
2-1/483.56445000373800388050534000422200462800
2-1/244500000420000436000600000480000520000
2-1/284.44550000466200483950666000532800577200
2-3/444.93566950468350488050690200517650566950
2-3/485.43624450515850537550750200570150624450
345.97686550567150591050835800626850686550
386.51748650618450644500911400683550748650
Source: ASTM A354-07a

A – Stress Area, in²=0.7854[D-0.9743/n]² where D=nominal diameter, in., and n=threads/in
B – Based on 125,000 psi for sizes 1/4 to 2-1/2″, inclusive and on 115,000 psi for sizes over 2-1/2 to 4″ inclusive
C – Based on 105,000 psi for sizes 1/4 to 2-1/2″, inclusive and on 95,000 psi for sizes over 2-1/2 to 4″ inclusive
D – Based on 109,000 psi for sizes 1/4 to 2-1/2″, inclusive and on 99,000 psi for sizes over 2-1/2 to 4″ inclusive
E – Based on 150,000 psi for sizes 1/4 to 2-1/2″, inclusive and on 140,000 psi for sizes over 2-1/2 to 4″ inclusive
F – Based on 120,000 psi for sizes 1/4 to 2-1/2″, inclusive and on 105,000 psi for sizes over 2-1/2 to 4″ inclusive
E – Based on 130,000 psi for sizes 1/4 to 2-1/2″, inclusive and on 115,000 psi for sizes over 2-1/2 to 4″ inclusive

Table 4: Mechanical Requirements for Machined Specimens

GradeDiameterTensile Strength min, psiYield Strength, 0.2% offset, min, pisElongation in 2" min%Reduction of Area, min, %
BC1/4 to 2-1/2 inclusive1250001090001650
BCOver 2-1/2115000990001645
BD1/4 to 2-1/2 inclusive1500001300001440
BDOver 2-1/21400001150001440
Source: ASTM A354-07a

ASTM A354 was approved Dec. 1st, 2007.

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